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#014 Basics of Blanking Work (4) Segmenting Work

Category : Shearing work
October 9, 2009
Figure 1 shows a diagram of realizing segmenting work. This is very often compared to cutting work because it is quite similar. While the directions of the burrs at the left and at the right of the product or opposite to each other in cutting work, these directions will be the same in segmenting work. On the other hand, scrap will be generated since the work is done along the width (along two lines). The rate of material utilization becomes somewhat poor compared to the cutting operation. Basically, this method is used when the directions of the burrs at the left and at the right have to be made the same. Fig. 1 Segmenting work

The relationship between the die dimensions and the product dimensions will be as shown in Fig. 2. The feed length (the feed pitch) will be equal to the product dimensions + the punch width. Any fluctuations in the feed length will appear as they are in the product dimensions. The clearance is made on the die side. Fig. 2 Die dimensions in segmenting work

Figure 3 shows a method of using the segmenting work. Fig. 3(a) shows a method of use in which the segmenting work is very clear. Two left and right symmetrical products or two products are produced because of the balance of the working force in bending or flange formation work or when the production quantity is large. Thereafter the segmentation work is made. Fig. 3(b) is the case when blanks are taken from a sheet material or a coil material. Scrap equal to the punch width will be produced. Fig. 3(c) is a modified application of (b). If the shape is as shown in the figure, and if the die dimensions are determined so that even the scrap becomes a product, it is possible to carry out the work without generating any scrap, and even the production efficiency becomes better. Fig. 3(d) is still another modified application. This form is very famous as the method for producing EI cores. In this case, the product has been designed considering the rate of material utilization and the production efficiency. This can be said to be an extremely superior working method that has cleverly matched the features of the product shape and the features of the working method. This can be said to be an example of the result of cooperation between pressing work and product design.

Fig. 3 Method of using segmenting work

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